Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30ffabacc9de77a…

MALICIOUS

PDF

105.9 KB Created: 2021-08-23 18:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e9eb82b9d9723f19e99833e2e0d0cc57 SHA-1: 53ec7f80e1d04e9e9c03bdc537202ecd2cd605a6 SHA-256: a30ffabacc9de77a0c5d2d627350fa057ef4ad5d40b575def09ca049a667dad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised CMS upload directories, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=fish+and+chips+new+zealand+accent PDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e05301c0b---53569904468.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f02d8707bc7---mepelokusegegizojusu.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/959c8214f7a1d515bfa502325f73663b/13681553829.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/42318989046.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/28152786029.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tt1g3aoehdmpsloldj4i9iug9h/51325054202.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kmj3ehc20g6qudf90e31b7ojt1/fukovivol.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4f0a9f5560b739c5cd39ee1bb690dc6b/fapumogara.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/suwazimonaxapiwape.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16114aee40bef5---wilowejadibujolubopevi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3382c6127---kizubuwixenuwelutuwoxilap.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607807fc02e5b---39304610581.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///29466245890.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/56296006615.pdfIn PDF document text
    • http://dytac.hk/userfiles/89128163033.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/sawuvugonegiwepovomajom.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160baff733b453---66526583239.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/vukulid.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec8238838---nokisironodigiz.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/27960971316.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17bf6208a4---62611592565.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc03ae61a---73848546236.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/j66hurpo3jueoq2086oo261jpl/liveputofunozodake.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/botimazidelud.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/36mdm0mt0r1jukabg3vvdr5bmb/kaluvodilulunamozujakubib.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012eeb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12EEB 18476 bytes
SHA-256: a1d596c8b47d6302bb290ba259e137e03e39ae9dd4b8d38b46b1f4fd77294ef0
font_00_sfnt_off000116fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 10516 bytes
SHA-256: af72f71a62a5c15f1810323f04cfda2dd602fb7c8ae589b1d40a9a1993072bc6
font_02_sfnt_off00014ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCD 20656 bytes
SHA-256: 323fa4cb1b5094bbef1e690f22f124fc8ae67b5c4b73f35c9fe64906b2bdb179
font_03_sfnt_off00018122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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